This standard specifies the determination method, instrumentation, test procedures and result calculation of the Roga index of bituminous coal. It is applicable to the determination of the cohesive force of bituminous coal. GB/T 5449-1997 Determination method of Roga index of bituminous coal GB/T5449-1997 Standard download decompression password: www.bzxz.net

ICS73.040
National Standard of the People's Republic of China
GB/T5449—1997
Determination of roga index of bituminous coal
Promulgated on April 17, 1997
National Technical Supervision Bureau
Implementation on October 1, 1997
GB/T5449—1997
This standard is revised according to the international standard ISO335--1974 "Hard coal-Determination of cohesion-Roga test" and GB483-87 General provisions for coal analysis and test methods, and is equivalent to ISO 335 in technical content. According to the provisions of GB/T1.193 and GB483-87, this standard retains the main technical contents of GB/T5449-85 in the revision, modifies the relevant terms and symbols, standardizes the expression format, and adds a preface to make the revised standard more reasonable and in line with ISO.
This standard replaces GB/T5449-85 from the date of entry into force. This standard is proposed by the Ministry of Coal Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Coal Standardization. The drafting unit of this standard is Beijing Coal Chemistry Research Institute of China Coal Research Institute. The main drafters of this standard are Yin Zhiye and Li Hongtu. This standard is entrusted to Beijing Coal Chemistry Research Institute of China Coal Research Institute for interpretation. 1 Scope
National Standard of the People's Republic of China
Determination of roga index of bituminous coal
Determination of roga index of bituminous coal This standard specifies the determination method, instrumentation, test steps and result calculation of roga index of bituminous coal. It is applicable to the determination of cohesive force of bituminous coal.
2 Referenced standards
GB/T5449—1997
Replaces GB/T5419—85
The provisions contained in the following standards constitute the provisions of this standard by being referenced in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest version of the following standards. GB474—1996 Preparation method of coal sample
3 Summary of method
1 Bituminous coal sample and .5B special anthracite are fully mixed and coked under strictly specified conditions. The coke obtained is subjected to grinding test in a specific drum, and the Roga index (R1.) is calculated based on the test results. 4 Instruments and appliances
4.1 Instruments
4.1.1 Balance: sensitivity 0.001g. bzxz.net
4.1.2 Glass and glass cover: porcelain, size see Figure 1M2
2Center ±1.5
Crum and crucible cover
Approved by the State Bureau of Technical Supervision on April 17, 1997, implemented on October 1, 1997
GB/T5449—1997
4.1.3 Stirring wire Made of nickel-chromium wire with a diameter of 1mm~1.5mm, see Figure 2.110
Figure 2 Stirring wire
4.1.4 Press block: nickel-chromium steel, mass 110g~115, see Figure 3. If the press block is found to be peeling during use, its quality should be checked at any time.
Figure 3 Pressing block
4.1.5 Press: pressure 5.9×10°Pa, dimensions see Figure 4pine
口250
1—base plate; 2—anti-head screw; 3—round seat; 1—steel pipe; 5—connecting plate; 6—blocking plate; 7—supporting shaft; 8—small shaft 9—washer; 10—opening pin; 11—support frame; 12—handle; 13—pressure weight; 14 lifting vertical shaft; 15 plug Figure 4 Press
CB/T5449—1997
4.1.6 Muffle furnace: constant temperature zone (850±10)℃, length not less than 120mm, and equipped with temperature controller. 4.1.7 Drum test device: It consists of two drums. The speed must be guaranteed to be (50±2) 1/min. The inner diameter of the drum is 200mm, the depth is 70mm, and the wall thickness is 3mm. Two baffles 180 apart are riveted on the wall. The length of the plate is 70mm, the width is 30mm, and the thickness is 3mm. The drum has a cover, and the cover and the drum fit tightly to ensure the sealing of the drum. See Figure 5. 4250
Figure 5 Drum
4.1.8 Round hole shoe: The hole diameter is 1mm
4.2 Required tools
4.2.1 Frame: Made of nickel-chromium wire with a diameter of 3mm-4mm. See Figure 6. 100
Center distance 50
Inner bee 1
4.2.2 Stopwatch.
4.2.3 Dryer.
Figure 6 Schematic diagram of glass rack
4.2.4 Flat shovel with handle: shovel length 180mm~200mm, width about 20mm, height 1.5mm, handle length 600mm~700mm4.2.5 Steamed bun.
4.2.6 Brush.
5 Coal sample
5.1 Test coal sample
The coal sample used for the test shall be prepared according to the preparation method of coal sample in GB474. Among them, the coal particles of 0.1n1m1~0.2mm shall account for more than 20% of the total coal sample. The coal sample shall be placed in a sealed container, and the time from sample preparation to test shall not exceed one week. 3
5.2 Special anthracite
GB/T 54491997
The anthracite used for the determination of Roca index shall meet the following requirements and be approved by the National Coal Standardization Technical Committee. —4 is less than 4%;
一Var is less than 7%
一Particle size 0.3m~0.4mm
一Sieve underrate is not more than 7%.
6 Test steps
6.1 First weigh 5g of special anthracite, then weigh 1g of test coal sample and put it into the crucible, weighing to 0.001g. 6.2 Use a stirring wire to stir the mixed coal sample in the crucible for 2min. The stirring method is: the crucible is tilted at about 45 degrees, rotated counterclockwise, 15 times per minute. The stirring wire is also tilted at the same angle and rotated clockwise, about 150 times per minute. When stirring, the ring of the stirring wire contacts the arc part connecting the crucible wall and the bottom. After 1min45s, continue stirring while gradually turning the glass and the stirring wire to a vertical position. After 2min, the stirring is finished. When stirring, the coal sample should be prevented from splashing. After stirring, use a brush to gently brush the coal powder attached to the crucible wall onto the coal sample in the volute. Then use a stirring wire to level the sample, and lower it by 1tmm~2mm along the surface of the crucible wall so that the sample can be placed in the same plane after the pressure block presses it.
6.3 Use a forge to place the pressure block in the center of the crucible, then place the crucible under the pressure device, and gently lower the pressure rod to press statically for 30s. 6.4 After the pressure is completed, the pressure block remains on the sample and is covered with a lid. Note that from the time of stirring, the crucible with the sample should be handled with care to avoid impact and vibration.
6.5 Place the crucible with a lid in a glass rack and use a flat pin to send it into the constant temperature zone of the muffle furnace that has been pre-heated to 850C. Within 6min of being placed in the muffle furnace, the furnace temperature should return to 850℃, and the furnace temperature should be maintained at (850±10)℃ thereafter. Start timing from the time of placement: coking 15tmin. After that, remove the compact from the muffle furnace and place it to cool to room temperature. If the drum test is not carried out immediately, place the compact in a desiccator.
6.6 Take out the compact from the cooled crucible. When there is coke slag attached to the compact, it should be brushed into the crucible and the total amount of coke should be weighed. Then the coke is sieved on a 1mm hole sieve. The part on the sieve is weighed again. Then put it into the drum for the first drum test. The coke block after the drum test is sieved with a 1mm round hole sieve, and the mass of the sieved part is weighed again. Then, put it into the drum for the second drum test. Repeat the screening and weighing operations and carry out 3 drum tests in succession. Each drum test is 5 minutes, that is, 250r. All weighings are accurate to 0.01g. 6.7 When the cohesiveness of bituminous coal is very weak, the coke slag is extremely loose, and the screening should be carried out very carefully. It is not advisable to shake the sieve. The bottom of the coke block should be gently placed on the sieve surface, and the coke block should be taken out and weighed together with the coke chips larger than 1mm. If the sample does not form a block after coking, screen out the coke crumbs smaller than 1mm and weigh the coke crumbs larger than 1mm. During operation, be careful to prevent the leakage or loss of small coke crumbs. 7. Calculation and report of results
7.1 Calculation of results
The following formula is used to calculate the Roga index:
wherein batch—total mass of coke after coking,; mi+m+m+m2
m,—mass of coke on the sieve before the first drum test, gm—mass of coke on the sieve after the first drum test·g:m,—mass of coke on the sieve after the second drum test, g; m
mass of coke on the sieve after the third drum test, g. 7.2 Report of results
The arithmetic mean of the results of repeated determinations shall be taken as the final result. The calculation results shall be rounded to the first decimal place and the reported results shall be integers. 4
8 Precision
GB/T5449—1997
The precision of the determination of the bituminous coal Roga index shall comply with the provisions in the following table Repeatability limit
Reproducibility critical difference
National Standard of the People's Republic of China
Method for determination of bituminous coal Roga index
GB/T 5449—1997
Published by China Standards Press
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Printed by Qinhuangdao Printing Factory of China Standards Press Distributed by Beijing Distribution Office of Xinhua Bookstore Sold by Xinhua Bookstores in all regions Copyright is exclusive and no reproduction is allowed
Format 880×12301/16
Printing Sheet 3/4:
Number of words 9,000 words
First edition in October 1997 First printing in October 1997 Printing run 1—800
Book number: 155066·1-14087
Price 8.00 yuan
Heading 318-046
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